Optical analysis and optimization of a beam-down receiver for advanced cycle concentrating solar thermal plants

作者: David Saldivia , Jose Bilbao , Robert A Taylor

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摘要: Next generation CST plants need to move towards higher operation temperatures and advanced cycles to obtain higher thermodynamic efficiency. Beam-down receivers (BDRs) can unlock higher operation temperatures via ground-mounted receivers which use solid and gas-phase heat transfer media—as opposed to nitrate salts, which have a <600 °C limit—and avoid the pumping requirements of a conventional tower-mounted receiver. This work presents a novel method to study the optics of BDRs, which is then applied to the most promising optical design. The flux distribution in both the secondary optical element (i.e., a hyperboloid mirror in the present study) and tertiary optical element (i.e., a polygonal CPC array in the present study) were obtained to calculate their optical efficiencies for a wide range of potential geometric designs. It was found that the main limitations on geometry were the hyperboloid …

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